

package com.hazelcast.sql.impl.client;

import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.SqlExecuteCodec;
import com.hazelcast.instance.impl.Node;
import com.hazelcast.internal.nio.Connection;
import com.hazelcast.internal.serialization.Data;
import com.hazelcast.security.SecurityContext;
import com.hazelcast.sql.SqlExpectedResultType;
import com.hazelcast.sql.SqlStatement;
import com.hazelcast.sql.impl.AbstractSqlResult;
import com.hazelcast.sql.impl.InternalSqlService;
import com.hazelcast.sql.impl.security.NoOpSqlSecurityContext;
import com.hazelcast.sql.impl.security.SqlSecurityContext;

import java.security.AccessControlException;
import java.security.Permission;

/**
 * SQL query execute task.
 */
public class SqlExecuteMessageTask extends SqlAbstractMessageTask<SqlExecuteCodec.RequestParameters> {
    public SqlExecuteMessageTask(ClientMessage clientMessage, Node node, Connection connection) {
        super(clientMessage, node, connection);
    }

    @Override
    protected Object call() {
        SqlSecurityContext sqlSecurityContext = prepareSecurityContext();

        SqlStatement query = new SqlStatement(parameters.sql);

        for (Data param : parameters.parameters) {
            query.addParameter(serializationService.toObject(param));
        }

        query.setSchema(parameters.schema);
        query.setTimeoutMillis(parameters.timeoutMillis);
        query.setCursorBufferSize(parameters.cursorBufferSize);
        query.setExpectedResultType(SqlExpectedResultType.fromId(parameters.expectedResultType));

        InternalSqlService sqlService = nodeEngine.getSqlService();

        boolean skipUpdateStatistics = parameters.isSkipUpdateStatisticsExists && parameters.skipUpdateStatistics;
        return sqlService.execute(query, sqlSecurityContext, parameters.queryId, skipUpdateStatistics);
    }

    @Override
    protected SqlExecuteCodec.RequestParameters decodeClientMessage(ClientMessage clientMessage) {
        return SqlExecuteCodec.decodeRequest(clientMessage);
    }

    @Override
    protected ClientMessage encodeResponse(Object response) {
        AbstractSqlResult result = (AbstractSqlResult) response;

        if (result.updateCount() >= 0) {
            return SqlExecuteCodec.encodeResponse(null, null, result.updateCount(), null, false, result.getPartitionArgumentIndex());
        } else {
            InternalSqlService sqlService = nodeEngine.getSqlService();

            SqlPage page = sqlService.getClientStateRegistry().registerAndFetch(endpoint.getUuid(), result, parameters.cursorBufferSize, serializationService);

            return SqlExecuteCodec.encodeResponse(result.getRowMetadata().getColumns(), page, -1, null, result.isInfiniteRows(), result.getPartitionArgumentIndex());
        }
    }

    protected ClientMessage encodeException(Throwable throwable) {
        // exception can be thrown before parameters are decoded
        if (parameters == null) {
            return super.encodeException(throwable);
        }

        nodeEngine.getSqlService().closeOnError(parameters.queryId);

        if (throwable instanceof AccessControlException) {
            return super.encodeException(throwable);
        }
        if (!(throwable instanceof Exception)) {
            return super.encodeException(throwable);
        }
        if (logger.isFineEnabled()) {
            logger.fine("Client SQL error: " + throwable, throwable);
        }
        SqlError error = SqlClientUtils.exceptionToClientError((Exception) throwable, nodeEngine.getLocalMember().getUuid());

        return SqlExecuteCodec.encodeResponse(null, null, -1, error, false, -1);
    }

    @Override
    public String getServiceName() {
        return InternalSqlService.SERVICE_NAME;
    }

    @Override
    public String getDistributedObjectName() {
        return null;
    }

    @Override
    public String getMethodName() {
        return "execute";
    }

    @Override
    public Object[] getParameters() {
        return new Object[]{parameters.sql, parameters.parameters, parameters.timeoutMillis, parameters.cursorBufferSize, parameters.schema, parameters.queryId};
    }

    @Override
    public Permission getRequiredPermission() {
        return null;
    }

    private SqlSecurityContext prepareSecurityContext() {
        SecurityContext securityContext = clientEngine.getSecurityContext();

        if (securityContext == null) {
            return NoOpSqlSecurityContext.INSTANCE;
        } else {
            return securityContext.createSqlContext(endpoint.getSubject());
        }
    }
}
